Blasting-cap.



' PATENTED AUG. 28, 1906.

D. MOEAGHERN.

BLASTING GAP. APPLICATION IILEI) DBO. 20. 190B.

A TTORNE Y3 claimed.v v

' In the drawings, Figure 1 is a side view of [To' rtllivhor'm itconcern:

DOUGALD 'MbEAQHERN. on nan OFFICE.

NAD Ai .AS-S'IGN ZJAM'ESI KAN EQ'OF"MARBLE. WASHINGTON.

AME-29,259.15.

' Be ,it known that I, DOUGALD McEAoHnii fi, asubject of the King ofGreat'Britain, and a resident" of. Erie, in the Province of British:Columbia and Dominion of Canada, have; .made certain new and useful 1mrovements' in Blasting-Caps, of which the f lowing is a specification.

-- My Invention is an improvement in blasting-caps, and hasforan objectto-provide af novel'constructionof cap-whereby to prevent the passage ofwater to the explosive within .the cap; and the invention-consistsincertain- ;novel' con tructions and combinations I wi'l-l'be hereinafterdescribed and I :of parts, as

a cap and fuse provided with myinvention.

Fig. 2 is a longitudinal'section thereof. Fig." 2o- I plugbeforeapplication to-the fuse; Fig. 4 is a'detail pers ecti-ve viewyofthe in -tool.

I n the use of blasting-caps much'inconven I 3 isva longitudinalsection? of the ca and Fig. 5 is a si e elevation-showing ecrimpience'results from the passa e of water to the.

*xplo'sive within the cap,,it eing found that thecri'm ing of the cap inthe usualinanner' skis not a ways eifecti've in preventing such pro vie, in connection with the ordinary cap jber-which forms a as";

'. ingitool to operate upon it to produce the sired packing actionwithout requiring so [much pressure 'of the "crim ing tool as to- "A,and the ordinary fuse B', a plug C of suitable material-such forinstanceias rublining for the cap'and is made sufliciently thimto permitthe crinpj. fracture or otherwise afi'ect t econtinuity of 40.Iginstan'ces when the mini ing is fected'the powder in the so that theflash will-not extend-to the endof the fuse and ignite the explosivewithin the the powder-filling within the forcibly 'efso will be broken,

cap. l It becomes im ort'ant, therefore, to make the tubular portion 0of the plug C thin in practice, so that it can'be readily operated uponwithout too much pressure; but

4 ---,.whi n made so thin and fitted within' the cap 5 there is atendency on the part of the tubular fortlon O" to roll up at itsouter-end-bythe iction ofthefuse 1n inserting the same, and this isobjectionable, as it tends to revent the proper insertion of the fuse. It erefore men use, which is a the crimping-tool'D, 10f the drawings.

passa e ofthe water. By myinvention'Iv fuse. some the atter, and inaddition this in inserting the plug within t provide my plug atits endwith an out; wardly-projecting annular .fl'ange C, which EORj'OF'ONE-H'ALF To specificatibnpf net er ratenez' Y- i Patqnted Ailg; as,not. "Application filed Dcoen her ;].906. Serial ll'o abuts' the openendof the cap A' and by its thickness prevents the rollin'" 1 end ofthelinin'g-plug and also forms I to limit the insertion of the-plug; as:will be understood from Figs.'1 1 and 2 of the drawings.

t the 'ordinary' .form,

and" as these caps I are usuall' supplied indifferent" sizes the imup ofthe outer a stop I will be" noticed that the cap maybe prove, plugs willalso be made indifierent I be supplied with the lining-plugs of thefuses.

for application to the ends thus avold'any chan' 1 In: use the plug,ter"being proper fuse end is inserted within the the explosive charge.v,After this the-capis crimped'one, two, or more times by the fuse ofthe tool shown in Fig. 5, as is usual in this-'- class of devices.

is fitted in the'cap' the ts;

sizes and will be fitted i'n their respective fitpalso' that-the caps asplaced,- onthe market f r 3 ready";

e from the cap in some, apted to be treated by such as shown Fig ;5

y charged, after whic'h'the plug closefto r As before suggested, thetubular body of the plug is made comparatively thin,rso it will notoccupy any considerables ace within the 'cap and 0 so ,it may e readilycrimped to secure thewater-tight packing; of

the fuse within the cap. At the same time the.outwardly-projectmgannular flange C atthe outer end ofthe 'plu'operates as a stop to limit the insertion of ti ca and also as a meansfor. preventing the rol iing up of the outer end of the tubular bod bythe friction of the fuse in inserting convenient portion to be'gra'spedby the hand e cap.

Havingthus described my invention, what I claim as new, and desire tosecure by Letters Patent, is 1'. A blasting-cap provided with a liningconsisting of a plug having a thin tubular body inserted wlthin the cap,and thickened at its outer end forming an outwardly-pro .jecting annularflange at the outer end of said tubular body and abutting the'outer' eplug into the.

flange forms a open end of the'cap and adapted to limit the.

and to preinsertion of the plugv in the cap,

end of the vent the rolling up of the outer plug by the friction of thefuse in insertin the-latter, substantially as set forth.

2. The combination of the cap, the liningplug having a thin tubular bodyportion fitting Within the cap, and an outwardly-projectingthickened'annular flange at the outer end of said body portion andabutting the open end of the cap and forming a stop to limit theinsertion of the plug, and also operating to prevent the rolling of theplug by the friction of the inserted fuse, and thefuse insertedin saidplug, the cap and tubularbody portion of the plug being crimped to forma Water-tight joint, all substantially as and for the purposes setforth.

3. A fuse-cap having av lining-plug for' blasting-caps consisting of athin tubular body portion open at both ends and thickened at its outerend providing an outwardlyprojeoting annular flange. DOUGAL'D MCEACHERN.

Witnesses:

SoLoN O. KEM N, J os. A. RYAN.

